Typewriting machine



g- 1940- w. A. DOBSON TYPEWRITING MACHINE 7 Sheets-Sheet 1 Filed Jan.19, 1938 ATTORNEY Aug. 6, 1940.

w. A. DQBSON TYPEWRITING MACHINE Filed Jan. 19, 1938 7 She ets-Sheet 2 5M .3 mm 8,

#2 m m R w m 6; w m w 4. 3 M R I 1a m QE v Aug.v6, 1940. w. A. DOBSONTYPEWRITING MACHINE Filed Jan. 19, 1939 7 Sheets-Sheet 3 8 m 6m -I w mmmm E @2/ i #S U N F 9 INVENTO WILLIAM A v R DOBSON,

' .ATTQ N Y g 6, 1940- w. A. DOBSON 2,210,569

TYPEWRITING MACHINE Filed Jan. 19, 1938 7 Sheets-Sheet 4 INVENTORWILLIAM A. Dossom BY i .ATTQ NEY w. A. DOBSON 2.210569 TYPEWRITINGMACHINE Filed Jan. 19, 1938 7 Sheets-Sheet 5 lNvENTdR WILLIAM A. DOBSON,

BY I

g- 6, 1940- w. A. DOBSON 2.210569 I TYPEWRI TING MACHINE Filed Jan. is,1938 7 sheets-shee s lNvENToR WILLIAM A Dossou m WT g.

98 95 my BY Aug. 6, 1940. w. A. DOBSON TYPEWRITING MACHINE Filed Jan.19, 1938 7 SheetsSheet 7 I I .u

INVENTOR WILLIAM A. DOBSON,

f l I I I r ll ATTO NEY Patented Aug. 6, 1940 UNETED STATES eTsNT orricsApplication January 19, 1938, Serial No. 185,724

2 Claims.

This invention relates to frame and mask structure for typewritingmachine in which a carriage travels laterally relatively to the body ofthe machine.

The invention deals particularly with the problem of masking the bodymechanism and carriage mechanism of a typewriter such as the Underwoodwherein a main frame for the body supports theprinting-instrumentalities and other mechanisms, and the carriagestructure travels laterally of the main frame.

A feature of the invention resides in arranging the mask structure sothat for machines having typing carriages of different lengths, aprincipal part of the mask serves for any one of such machinesirrespective of the carriage length, but which principal-mask part mayreceive supplemental-mask elements or casings adapted to maskcarriage-rail-supporting arms or horns that extend laterally from, andare usually a part of the main frame. Since the carriage-rail may varyin length according to the different lengths of the carriage, said armsor horns may also vary in their lateral extent or spread from said mainframe or body of the machine. The supple mental-mask members may bedifferently proportioned so as to mask said different arms or horns andso that these arms or horns, like the main frame, need not beexpensively finished.

The principal-mask part has sides having forwardly extending toe-partsthat are spanned at their front ends by a cross-sill and serve with thelatter to hem or frame the keyboard. Therefore, the usualkeyboard-framing part of the main frame may be dispensed with. Saidkeyboard-framing part of the main frame being dispensed with, the usualside-members of the latter may be strongly connected by a simplecross-bar which may be disposed at the front of said sidemembers,immediately behind the keyboard, and near the base of the machine sothat the usual key-levers may extend rearwardly thereover from thekeyboard.

The principal-mask-part sides having the forwardly-extendingkeyboard-side-framing toes, may originally be separate pieces; and thecrosssill for framing the front of thekeyboard may also originallybe aseparate piece. These separate pieces may be adapted to be permanentlyconnected as by end-matched joints where the side-sills meet the fronttoe-parts of the mask sides. The separate pieces may be permanentlyattached at said joints as by riveting, soldering, brazing orspot-welding. These pieces, since they are originally separate, may beproduced eco nomically and by mean of forming dies of moderate cost.Butthe invention is not limited to making the principal-mask part sidesand the cross-sill of separate pieces, since, as far as certain otherfeatures of the invention are con- 5 cerned, said sides and cross-sillmay be struck up in one piece from a single blank.

A feature of the invention resides in arranging the mask-to covermechanism that is usually disposed at the back of the machine or itsmain 1 frame, An example of such mechanism is the column ofdenominational tabulating stops mounted, as in the Underwood machine, ina fixture attached to the back of the main frame, the tabulatingmechanism also comprising structure that is disposed on the carriage.

The carriage carries the usual r'evoluble platen and also carries a rearpaper-table that slopes downwardly and forwardly toward the bottom ofthe platen to support a work-sheet and guide it for rear insertionaround the platen. Said rear paper-table spans the usual carriage-endmembers. Viewed from the front of the machine, the paper-table masksmechanism, such as tabulating-stop structure carried by the carriage atthe back thereof. B-ut viewed from the back of the machine, suchmechanism is usually exposed. A further feature of the invention residesin completely masking such mechanism, and, to this end, the paper-tablemay have depending therefrom, or meeting its rear top edge, an apron,said paper-table and apron thus forming a masking shed or canopy.The'apron may conform with with a rear wall of the principal-mask part.Said rear wall may span the sides of the principalmask part and may beattached thereo. Further, said rear wall may be spaced from the back ofthe typewriter frame so as to provide room for mechanism at the back ofvthe typewriter frame such as the aforesaid d-enominationl tabulating-4.0 stop mechanism; said rear wall thus cooperating to mask saidmechanism. Although the lower edge of the apron on the carriage and theupper edge or part of said rear wall are made contiguous to gain theeffect of an unbroken rear masking wall for the entire machinestructure, it will be understood that said apron and rear wall are freefrom one another in order to permit lateral travel of the apron with thecarriage,

A side paper gage is adjustable transversely of the paper-table, and afurther feature of the invention is in provision whereby the side papergage is supported, and is guided for transverse adjustment at theunderside of the paper-table so that the paper-table masks saidconstruction.

Members on and at the end of the carriage are adapted to mask thecarriage ends and, for this purpose, to co-oper'ate with ends that formmasking enclosures connecting the paper-table and its adjacent rearapron. These carriage-end masking members may be adapted to match andharmonize with the contours of the sidewalls of a principal-mask part,it being further contrived to have said mask-side-wall contours closelyhem the path of the carriage so as to get the utmost masking effect.

For giving access to the types, the principal or universal-mask part mayhave a displaceable type cover or door, and another feature of theinvention resides in novel inexpensive construction of a finger-piece orknob for said door, and which construction produces a knob havinglineaments harmonizing with the lineaments of the improved maskstructure.

Other features and advantages will hereinafter appear.

In the accompanying drawings:

Figure 1 is a perspective illustrating the frame and principal-mask partdisposed. around said frame, the arrangement being for a machine havinga carriage of standard length.

Figure 2 is a plan view of the parts seen in Figure 1, but showing themain frame and the principal-mask part with its rear wall detached andthe principal-mask-part sides sprung apart laterally to pass themain-frame side-members.

Figure 3 is a sectional front elevation of the main-frame side-memberand the principalmask-part side adjacent to said side-member, thesection being taken on the trace 33, Figure 15.

Figure 4 is a fragmentary side view of the machine showing the maskingfeatiues for the carriage ends and the harmonious conformation of saidfeatures with the contour of the principalmask-part side.

Figure 5 is a cross-sectional side elevation of the machine and shows aprincipal-mask part, the masking features on the carriage, and thearrangement for masking mechanism, at the back of the machine, such asthe illustrated tabulating mechanism.

Figure 6 is a front elevation showing the principal-mask part, and,attached thereto, the supplemental-mask members for arms or horns thatsupport a carriage having certain length greater than standard; one ofsaid supplemental-mask members and the principal-mask part being shownpartly broken away and in section to illustrate details.

Figure '7 is a perspective of the principal-mask part andsupplemental-mask members seen in Figure 6.

Figure 8 is a front elevation showing the principal-mask part and asupplemental-mask member attached thereto, such supplemental-mask memberbeing for a carriage of greater length than the carriage associated withthe supplemental-mask member seen in Figures 6 and 7.

Figure 9 is a perspective showing the principalmask part and thesupplemental-mask member of Figure 7 in detached relation, to illustratedetails.

Figure 10 is a perspective illustrating details of the novel finger-knobfor the door or cover that gives access to the types.

Figure 11 shows, in. side elevation, the supplemental-mask member ofFigures 6 and 7 in place against the principal-mask part.

Figure 12 is a perspective of the supplemental mask member as viewedfrom a direction opposite to that of Figure 9.

Figure 13 is a perspective showing the rear paper-table, the rearmasking apron associated therewith, and the paper side gage andsupporting features for the latter, parts being shown broken away andsectioned, to bring out details.

Figure 14 is a perspective showing details of the paper side gage andits connection with a supporting bar, parts being shown broken away and.sectioned, to illustrate details.

Figure 15 is a top plan showing, in assembled relation, the main frameand the principal-mask part for a machine having a standard-lengthcarriage, parts being broken away and sectioned, to bring out details.

Figure 16 is a perspective showing parts of one of the varioussupplemental-mask members, and the mask wall in separated relation, tobring out details.

Figure 17 is a perspective of the masking shed formed by the rearpaper-table and rear apron thereon, and illustrates structure forsupporting a side gage, the view being shown broken away and sectionedin parts, to illustrate details.

Figure 18 is a front elevation view showing the Figure 16 parts inassembled relation with the main frame.

In a typewriter such as the Standard Underwood, the working parts aresupported in a main frame that includes left and right members 25, 2E,and a frame-back-forming crossmember 21 rigidly joined to, and(Jo-operating to hold said sidemembers in laterally-spaced relation.Each sidemember 25 or 25 has a top rim or edge 28 above which rises, inthe front, a horn 29 for supporting front carriage-rail 3i and at therear there rises above said top rim a horn 3! for supporting a rearcarriage rail 32, the latter having rearwardly-extending plates 33seated as at Figure 5, upon the tops of the rear horns 3| and secured byscrews 35. The front carriage-rail 3B is seated upon the: front horns 23as at 36 and is secured by screws 37.

The typewriter carriage 45, Figures 4 and 5, includes a frame having asits parts a front bar 4|, 2, rear bar 42 and side-end members 43. Therear bar 42 has depending lugs 45 slidably fitting the rearcarriage-rail 32; and the front bar 4! is provided with rollers 45fitting a channel 4'! out along a rear face of the front rail Bil; thetypewriter carriage being thus adapted to travel upon said rails 35, 32.

A revoluble platen 49, Figure 5, is journaled in left and right endplates 55, see also Figure 13, of a frame having the usual connections(not shown) to the carriage frame ll-43 in order to be movablerelatively to the latter for case-shifting; and a roller 51 on thecase-shiftable frame runs upon the usual shift rail 52 that is movableup and down and forms part of the Underwood case-shift mechanism.

The key-levers 53, Figure 5, mount numeral and alphabet type-keys 55 andare operatively connected by suitable means, not shown, to typebars 55to swing the latter upwardly and rearwardly, from their normally cumbentposition, Figure 5, to print against the platen 49. At operation of anytype-bar 55, or of a space-key 55, the usual escapement-mechanism (notshown) co-operates to letter-feed the carriage. Said type-keys 45, thespace-key 55 and denominational tabulating keys 5? constitute the usualkeyboard 58 at the front of the machine, Figures 5 and i5.

Denominational tabulating' stops 60, Figure 15, are mounted in acolumn-like fixture GI shown attached, Figures 5 and 15, to the back ofthe main-frame crossbar 2i. Said denominational stops 6U co-operate withcounter-stop mechanism @3, Figure 5, mounted on the carriage by means ofbrackets $4. The arrangement of said counter-stop mechanism, thedenominational tabulating stops till, and the connection of the latterto the denominational tabulating keys 5'! presents mechanism, part ofwhich is at the back of the machine as, for example, the fixture BI, andpart of which is mounted on the carriage as, for example, thecounter-stop mechanism 63. The types print through a ribbon (not shown)which winds ofi and on to ribbon spools 65, which, in. the Underwoodmachine, are located as in Figures 5 and 15.

Cross-rods 6'! may be threaded through and supported by theframework-horns 29 and may be retained in the latter as by means ofscrews 88 that may also serve to adjust the rods endwise, said rods, inthe Underwood machine, mounting the usual carriage-travel-limitingmargin-stops (not shown).

For a machine having a carriage of standard length, say, for anll-inch-long platen, and, therefore, hereinafter described as an ll-inchcarriage, the front-rail horns 29 flare or reach outwardly as at 10,Figure 1, so as to support the front carriage rail 30' at points thatare spaced apart more than are the bodies of the frame sidemembers 25,26. Similarly, the rear horns 29 flare outwardly as at H, Figure 1, soas to support the rear rail 32 at points that are spaced farther apartthan are the bodies of the side-members 25, 26.

For a machine having a longer carriage, say, fora 12-inch platen, thefront horns 29 are spaced from the bodies of the side-members 25, 25 bylonger lateral reaches 12, Figures 6 and 9, so as to support the longercarriage rail 30 at more widely-spaced points than in thell-inchcarriage machine. For the still wider or 14-inchcarriage machine,the front horns 29 are spaced apart by still longer reaches 13, Figure18. It will be understood, then, that the horns 29 may have lateralreaches of different extents corresponding to the length of thecarriage. The maximum reach herein shown by way of illustration is seenat M in Figure 8. The rear horns 3! for the rear carriage rail 32 areherein shown as having the same lateral reaches for all machines. But itwill be understood that the'lateral reaches of the rear horns 3| mayalso vary, if desired, according to the length of the carriage and itsrear rail s2.

The novel frame and mask structure will now be described. 7

The main-frame side-members 25, 26 are made so that their forward extentends as at pads 15 and thus extends forward no farther thansubstantially the back of the keyboard 58, this being in distinctionfrom former machines in which the side-members were prolonged forwardlyand were connected by a front cross-sill of the main frame to hem orframe the sidesand front of the keyboard, such as 58. Instead of suchformer cross-sill the present construction includes a cross-member itthat is attached as at '80, Figure 1, to said pads 15 and is near thebase of the machine, Figure 5, so that the key-levers 53 extendrearwardly thereover to a fulcrum-rod 11, Figure 5, near the back of themachine.

A mask for the main body of the machine ineludes left and rightside-walls 18. For an 11- inch-carriage machine the side-walls areadapted to conform with the under-part contour of the front carriagerail 38 as is indicated at 19, Figures 1 and 5, and the inner faces ofthese side-walls may be close to the outer sides of the front horns 29of such ll-inch-carriage machine. these horns do not project much beyondthe bodies of the main-frame side-members 25, 26, the entire side areaof the side-wall 18 may be substantially flat and therefore in thesamevertical plane asthe part of the side-wall that is adjacent to thehorn 29, as illustrated in Figure 1. Thus, the lateral spacing of theflat-area sidewalls 18 corresponds substantially with the lateralspacing of the outer sides of the horns 29 for an l1inch-carriagemachine.

Referring to Figures 1 and 15, each side-wall l8 has an inwardly-turnedflange 8! and is shaped so that said flange is contiguous to the frontedge of the rail. 38, as at B2, and slopes abruptly downwardly therefromand then turned forwardly to form a sill or toe 83, that hems and framesthe side of the keyboard. Another inward-turned flange-part of eachside-wall 18 starts at a point 84, Figures 1 and 5, adjacent the back ofthe horn 2S and extends horizontally rearwardly, as at 85,

and then drops and turns, as at 86, to a lower horizontal part 81conforming with, and in overlying contiguity to, the top rim 28 of themain frame 25 or 26. From the part 81 the flange continues upwardly to abreak 88 that ends at 89 and clears the rear horn 35. The flangecontinues after the break 88, 89, in a rearwardly horizontal part 90 andfrom the latter there continues downwardly a back flange SI of thesidewall 18.

The keyboard-framing toes 83 of the mask sidewalls 18 are joined attheir forward ends to a cross-sill 92 that hems or frames the front ofthe keyboard 58. Said cross-sill 92 has an inwardlyturned flange 93 thatmatches the flanges 8| of the side-walls T8. The side-walls l8 and thecross-sill 92 are originally separate pieces, said pieces beingpreferably struck up from sheet metal. For joining and attaching saidpieces, the ends of the cross-sill 92 and the forward ends of theside-wall toes 83 are mitered as indicated at 95, Figures 2 and 15, toform butt joints. The joints may be made secure as by soldering, brazingor welding. Overlap plates 96 may be placed at the joints to securethem. In Figure 15 spotwelding of the overlap plates to the cross-sillS2 and to the side-Wall toes 83 is indicated at 9! After they are joinedtogether the side-walls l8 and the cross-sill 92 form a unitary part.

The bottom edge of the side-walls Iii and crosssill 92 may also bein theform of an inwardlyturned flange 98. Said bottom flange 98 may have ears99 adapted, as by means of perforations I00, to be clamped betweencushioning feet NH and foot bosses I02 of the main-frame sides 25, 26 asin Figure 5. A screw 1% projects from each foot through the ear 99 andmay be threaded into the foot boss W2. A washer H32? of sounddeadeningmaterial, such as felt, faces each foot boss 12 so as to be interposedbetween the latter and the ear 99 for preventing transmission ofmachine-sound vibrations to the masklfl, 106. For this latter purpose,also, the perforations Hill in the ears 99 are made large enough so thatsaid cars 99 do not contact the foot screws H13 and, therefore, the footscrews Hi3 may be shouldered directly against the foot boss Hi2, as inFigure 5;

The rear edge flanges SI of the side-walls 18 Since have secured totheir inner surfaces, as by weld spots I04, tabs I05, Figures 1 and 15,that form seats for attaching a rear wall or cover I06 of the mask. Saidrear wall I06 is removably attached to said tabs by'screws I01 and maybe substantially flush with the side-wall-rear-edge flanges 9| asindicated in Figure 5. At its top the rear wall I06 is bent forwardly toform a top-masking part I08 that is flush with the inwardly-turnedflange part 90 of the side-walls. Said top-masking part I extendsforwardly to a line slightly separated, for sound-vibration insulation,from the rear carriage-rail 32, as is indicated at I09, Figure 15, saidtop part having a cut-out I I0 to receive and frame the tabulating-stopfixture M, the latter preferably rising above said top-masking part asindicated in Figure or in Figure 1. The rear wall I06 has an inturnedbottom-edge stiffening flange I I I.

For masking the space between the marginstop supporting cross-rods 61and a key-lever comb-plate I I4 that is attached as by screws II5 tobosses I I6 of the main-frame side-members 25, 26, the construction maybe as follows, Figures 1,

5, 6, 7 and 9: Each side-member 25, 26 presents a forwardly-facing pador boss I I1. A maskingplate II8 has side margin-portions II9 that areoffset, as at I20, forwardly of a plate-portion I2I that is between saidmargin-portions H9. Said masking-plate II8 has a rectangular opening I22arranged to give access to the array of types I23 on the type-bars 55,the latter being normally cumbent in their usual arcuate array, asdiagrammatically indicated at Figure 5.

Extending inwardly from the mask walls 16 are wings or fins I24,substantially as seen in Figures 2 and 6 and attached to the side-wallsas by spotwelding or riveting I25. Said fins I24 serve for attaching themask side-walls 18 to the frame side-members 25, 26 and are adapted toreceive screws I26 that also secure the masking-plate I I 8 to saidside-members 25, 26, said fins I24 being between the screw-receivingmargin-portions I2I of said plate H8 and the bosses II1, Figure 6.Fitted into the rectangular opening I22 of the front masking-plate IIBis a door I21, Figures 5 and 8, hinged at I20 to ears I20 projectingfrom the masking-plate H3, as in Figure 5, the back of the door I21having hinge-ears I30, Figure 5. The back of the door is faced withsound-insulating material I3I, such as felt, and the upper margin of thelatter engages a stop-bar or bars I32 attached to the back of the frontmask-plate I I8, the arrangement being such, Figure 5, that the front ofthe door I21, in closed position, and the front of the mask-plateportion I2I are substantially flush. Attached as at I33 to one of thedoor ears I30, is a spring I39 which is also attached to the key-levercomb-plate I I4 and keeps the door I21 normally closed against thestop-bar I3I. The back of the masking-plate H8 is also faced withsound-insulating material, as indicated by the cut-outs I3I Figure 8, insaid material around the ears I29.

A novel finger-knob for the door I21, designed to harmonize with thegeneral mask-structure, is constructed as follows, referring to Figures9 and The door has a vertical slot I34 that opens at the top and bottominto slots I35. A button I36, Figure 10, is diametrically reduced ateach side I31 to form a middle flange I33 that is received in the doorso that the reduced sides I31 of the button are shouldered against theface of the door at the side edges of said vertical slot I34. A strapI40 of thin sheet metal, such as brass or soft steel, has a central slotI4I to form spaced bands I42 to engage over the reduced sides I31 of thebutton and to receive and retain therebetween the middle flange I38 ofthe button, the flange preferably projecting outside of said bands tostand in relief from the latter. The strap I40 may be initially bent atone end to form a tab I43 which is inserted into one of the transverseslots I35 of the door-opening. With said tab thus inserted and with theflange I38 of the button in place between the strap bands I42, and withan unbent end I44 of the strap inserted in the other transverse slot I35of the door, said end I44 is then bent, as indicated at I45, against theback of the door to secure the strap I40 and button I36 in place. Thebutton I36 and strap I40 may be finished in contrasting colors, such asblack for the button, and chromium plate for the strap I 40. The sidefaces of the button may be concaved or otherwise suitably formed so asto be conveniently engageable by the fingers.

The construction relating to masking the typewriter carriage is asfollows: Referring to Figures 5 and 13, the end plates 50 of thecase-shiftable platen-frame have upper and lower ta'bs I41. A cross-barI48 is rigidly connected, as at I49, to the upper tabs I41 to support arear papertable I 50. A sound-deadening backing I5I, such as felt, ofsaid paper-table serves also to insulate the latter from the cross-barI48. The papertable I50 has spot-indentations I52, to recess the headsof screws I 53 that secure the papertable to the cross-bar I48 which maybe correspondingly indented, as at I54. to receive the formation of thepaper-table indentations I52 and the felt backing I5I. The arrangementis such that the paper-table I50 extends downwardly and forwardly sothat a slightly downwardly-turned lower edge I56 thereof is contiguousto the rear edge of a paper guide I51 disposed under the platen 43 as inFigure 5. Tongues I58 of the paper-table I50 rest on the lower tabs I 41of the case-shiftable frame-plates 50 and have slots I50 to receivepaper-table fastening screws I60 that are threaded into said lower tabsI41. Fig ure 5 indicates the lower tabs I41 and said screws I60 disposedso that the apron I51 guides a worksheet clear of the heads of saidscrews I60.

The paper-table I50 is joined as at I 63 to a rear apron I64, the papertable and apron I64 thus forming a shed adapted to mask the counter-stopmechanism 63 on the carriage or any other mechanism that issubstantially similarly disposed at the back of the carriage. At thesides of the carriage the masking-shed I50, I64 is closed by side piecesI65, Figures 5 and 13. The paper-table I50, the rear apron I64 and theside pieces I65 may be struck up from a single sheet-metal blank in thatthe latter is bent as at I 63, Figure 5, to form the peak of the shedand is further bent as at I66, Figure 13, to form the rear side cornersof the shed, and to bring an edge of each side piece I65 against theunderside of the paper table as indicated by the seam or seam-line I61,Figures 13 and 17. Left and right channel-shaped corner pieces I68, I69,Figure 17, are secured to the paper-table and the side pieces I65 as byriveting I 10 to bind the seam I61. The left-hand corner piece I68 isprovided with a slot I II to receive the end of a cross-bar I12 thatsupports a side paper guide I13 as will presently be explained. Theother end of the cross-bar I12 is received in a slot I14 of theright-hand corner piece I 69 and may be detachably secured by a screwI15, shown headed against a flange preferably formed of sheet metal, andthe paper- I13 of the corner piece I69. The screw I15 may be threadedinto the channeled cross-bar I12.

the cross-bar I12. The right side piece IE5 is formed with a tongue I55to receive thereupon the right end of the cross-bar I12 which isdetachably secured tosaid tongue I55 by a screw I6I. Simple angle-bars55 bind the seams I61.

The side paper-gageflt is turned up from a strip I16 adapted to overliethe paper-table I50 and the rear apron I84, the latter is formed with atransverse sl-ot I11, Figures 13 and 17, adapted to admit an extensionI18 of the side-paper-gage strip 216, said extension being turned underthe paper table by a bend I19 and being adapted to ride upon thecross-bar I12 in that it has side ears I3 9, Figure 14, bent therefromand formed with T slots 19! to slidably fit said cross-bar I12. Saidextension I18 also includes a spring tongue I62, Figure 14:, adapted tobear upon the underside of the cross-bar I12 so as to co-operate tofrictionally detent the side paper-guide structure I13, I16, I18, I88 atdifferent positions of lateral adjustment. It will be understood thatthe slot I11 in the rear apron I64 is'co-extensive with anydesired rangeof lateral adjustment of said side paper-guide gage structure. Theside-gage strip I16 may be formed with a pointer I82 that cooperateswith a scale I83 upon the paper-table I58 to indicate the positions ofthe side guide I13. The side-gage structure I13, I16, I18, I88 istable-overlying strip I16 thereof may have a .pad I84, Figure 5, of feltso as to prevent direct contact of said strip 316 with the paper tableI58.

The rear portion of the paper table I50 over which the side-gage stripI15 lies may be offset suficiently below the front portion of thepapertable as by a bend I85, Figure 5, so that said front portion andthe side-gage strip I16 are substantially flush. The front end of saidstrip I16 may also be curled slightly as at I86, Figure 13, to point itsend below said front portion of the paper-table.

The inner face of the paper-table apron is also lined withsound-deadening material I81, such as felt. The lower edge of the apronI64 and the edge of its slot I1I may be curled as at I88 to broaden saidedges and stiffen the structure.

The rear apron I64 on the carriage and the rear wall $99 of the mainmask are arranged,

Figure 5, to present a substantially continuous sweep of contour fromthe bottom or said rear Wall I06 to the peak I63 of the shed'formed bythe paper-table 55-6 and its rear apron I84. The

bottom of said rear wall I88 is shown offset rearwardly relatively tosaid peak I63 and the bot tom edge of the apron I64 so that said sweepof contour is upwardly and forwardly toward said apex, thus conducing toa pleasing stream-line effect in the lines of the mask.

Referring now to Figures i, 5 and 13, the carriage ends are shrouded byright and left masking-plates 399. Each plate I99 has a contour I9Iformed to match substantially the contour 85, 86,81 and 90 of the mainmask side-walls 18,

.members 25, 25;

thereby to gain harmonization in the appearance of the masking featuresof the carriage relative to the main mask. Said carriage-end maskingplates I99 have top flanges I93 that may overlie similar flanges I94 ofthe case-shiftable-frame side plates 58 and may be secured to saidflanges I94 as by screws I95, Figure 5. The top flanges of saidcarriage-end masking plates. I98 may curve downwardly and rearwardly asat I96, Figure 4, so as to be substantially flushwith the rear apron I8and so that the said end masking plates I86 co-operate with the sidepieces I65 of the shed I59, GM toenclose said shed at its side ends.

It has been explained that the side walls 18 of the main mask-portionare spaced apart laterally in accordance with covering, Figure l, the1l.-inch-carriage-machine horns 29, since these horns 29 are offsetlaterally a comparatively small extent from the bodies of the main-frameside- Referring now to Figures 6, 7, 9, 11 and 12, the main mask isshown adapted to a lz-inch-carriage machine having front-carriage-railhorns 29 offset laterally by the reach '12 a greater extent than are thehorns'of the 11- inch-carriage-machine. Such main. mask has itsside-walls 13 spaced laterally the same extent as the side-walls 18 forthe ll-inch-carriage machine. Thus, there is formed a principal-markpart having a rear wall I86 and a front-keyboard frame cross-sill 92that are of the same widths as for the l2-inch-carriage machine as forthe ll-inch-carriage machine; and the same will be true, as will laterappear, for machines having still wider carriages.

The side-walls 18 of said principal-mask portion are each thereforeprovided with a front carriage-rail-horn-clearing jog or cut-out definedby the horizontal edge I98 and the vertical edge I99, Figure 9. Saidside-walls 18 may be formed with the same tools or dies that areemployed to form the side-walls 18, in that it is only necessary, afterthe formation of the latter, to cut or adapt the same to form the jogI98, I99.

For masking the horn 29 having thewider reach 12, Figure 9, asupplemental-mask member 288 is board-side-framing toe 83 of the maskwalls 18% At its top said flange 202, of each part 2!, is turnedrearwardly to meet substantially with a lateral extension 283 of thefront-masking plate H8 that is provided for the 12-inch-carriagemachine. The top-margins of the plates IIB for the machine havingdifferent carriage widths may be each curled rearwardly, and it will beobvious that the extensions 293. are substantially extensions of suchcurled margins or cowls to maskthe front-horn reaches 12. Said part 28Imay be attached as by a wing 285 thereof and spot-welding or riveting286, Figure 12, to a front Wall 281 of a horn-masking shell 288, saidfront wall 291 extending, as in Figure '1, downwardly from the front ofthe IZ-inch-carriage rail 38 Said horn-maskingshell 298 has a side-wall289 formed ,as at 2H3 to hem the underside of said carriagewall 299 ofsaid shell 288 is turned inwardly at the bottom as at 2! to set over thehorizontal edge I98 of the mask-wall 78 Said shell 298 may be providedwith a tongue 2! adapted toabut the main-frame side-member 25 or 26, asat 255, Figure 6. A sound-deadening pad (not shown) may be interposedbetween said tongue 2M and the side-member 25 or 25. The part has aninwardly-extending fin 2!! similar to the fin 524 that was hereinbeforedescribed with reference to'the standard-carriage-machine mask, fin 2!!being disposed between the margin portion IE9 of the front masking plateI I8 and the main-frame boss II! so as to be clamped by means of theupper screw I25. It will be seen now that said fin 2II, screw I28,tongue 2I4 and stop 2!2 co-operate to locate and retain thesupplemental-mask element 29!, 288 in place.

Referring now to Figures 16 and 18, a supplemental-mask member 228 tocover the front carriage-rail horn 29 of a machine having a 14-inchcarriage is represented. For such machine the principal mask-portionside-walls 18 have the same lateral spacing as for the 11 and12-inchcarriage machines and like the 12-inch-carriage machine, themain-mask side-wall I8 has the cut-out !98, I99.

The wider-machine supplemental-mask member 228 is made verticallyelongate. Therefore, said supplemental-mask member 22!! includes a shell22! having a side-wall 222 that tapers, from a part 223 thereof that isalongside the horn 29, toward the bottom of the main-mask wall 78 asshown in Figures 16 and 18. Said side-wall 222 may be formed in oneplace with a front wall 224 and a rear wall 225 of said shell 22!. Thefront wall 224 has a top portion 226 turned inwardly to meet a lateralextension or cowl 22! of the front mask-plate II8 that is adapted forthe 14-inchcarriage machine, Said front wall 224 also has a top portion228 at a higher level than the top portion 228 so as to be contiguous tothe front of the front carriage-rail, such as 39, for the 14- inchmachine. Said supplemental-masking member 220 also includes a part 28!,Figures l6, 18, which is like the hereinbefore described part 28! forthe supplemental-mask member 288 for the IZ-inch-carriage machine, andhas a wing 285 for attachment to the shell 22! as by riveting 286,Figure 12. The rear wall 225 of the shell 22! of the supplemental-maskmember 220 sets facewise against the edge I99 of the mask wall I8 Forthe l l-inch-carriage machine, the maskwall I8 is provided with slots238 to receive fastening hooks 23! formed on the edges of the front andrear walls 224, 225 of the supplementalmask-member shell 22!. With saidhooks 23! inserted in said slots 23!], and the supplementalmask member22!], slightly tilted sidewise, the latter is drawn upwardly so thatsaid hooks interlock with the upper edges of said slots 23!]. Thesupplemental-mask member is then turned about said hooks to entertongues 232, also formed on the side edges of thesupplementalmask-member shell 22!, into companion slots 233 formed inthe mask wall 78 Figure 16. The tongues 232 may fit without verticalplay in said slots 233 and the supplemental-mask member is thus retainedvertically. The part 29! also has a fin 2!! that co-operates to keep thesupplemental-mask member 229 in place in that it is interposed betweenthe front masking plate H8 and the boss II! on the machine frame and isclamped by means of the screw I26. The mask Wall l8 also has a wing I24for attachment to the boss I I! by means of the lower screw I26 and themask-plate H8. The rear wall 225 has a stop 2I2 to set against themask-wall I8 Figure 18.

Figure 8 shows a supplemental-mask member 235 adapted for a machinehaving a still wider carriage than is represented by the construction ofFigure 18. Said supplemental member 235 includes a horn-masking shell236. A part 20! is attached to said shell 238 as hereinbefore describedwith reference to the 12 and 14-inchcarriage machines. To co-operate tomask the wider reach I4 for the horn 29, Figure 8, the front mask wallII8 has a lateral extension 23!. The mode of attaching thesupplemental-mask member 235, Figure 8, to the side-wall 18, the latteralso having a jog I98, I99 is substantially as described with referenceto the 14-inch-carriage machine, said mask-member 235 having the lowerhooks 23! and the upper tongues 232 and also having the fin 2 I I on thepart 28! for attachment to the boss II! of the main frame. One variationsuggested by the Figure 8 construction is to have an edge 238 of theshell 236 extend from the part 28! to the hornmasking part 239 of saidshell, said edge 238 being adapted to harmonize with the lateralextension 231 of the front mask wall I I8, Figure 8.

The several supplemental-mask members 20!], 229, 235 may have asound-proof lining as indicated at 249, Figure 6. To conduce todeadening the machine noises the main mask is adapted, so as to avoid,in the main, contact with the main frame of the machine, as isexemplified at 24!, Figures 3 and 5, and by the insulation I82 betweenthe mask cars 99 and the foot bosses I02 of the main frame. Theside-walls I8 or I8 and the rear wall I86, I88 may also have asoundproofing lining as exemplified at 234, Figures 5 and 6.

As indicated in Figures 1, 3, 7 and 15, the mask walls I8, or 18 may berecessed or niched at their bottom edges as indicated at 242. Thefingers of the hands may take hold in such side niches 242 for thepurpose of lifting the machine bodily, The niche may be bounded by aninner side-wall 243, a top-wall 244 and end-walls 245, Figure '7. Theseniche walls may be formed by a die-drawing operation or they may be madeseparately in whole or in part and attached to the side-walls I8 or 18.

The front-mask wall IIB may have a slot 246 through which protrudes afinger-piece 24!, Figure 6, the latter in the Underwood machine servingas a ribbon-throw adjuster for selecting different ribbon colors orrendering the ribbon ineffective. The mask-wall II8 may have suitableindexes 248 for the different positions of the finger-piece 241.

It will be seen now that the described maskstructures avail foreconomically and effectively masking a typewriter, such as theUnderwood. The masking-structure around the inner or main frame iseasily removed or replaced inasmuch as it is only necessary to removethe rear wall I06, I08, the feet I!!! and the front-masking plate H8,all these being easily removable or replaceable, in order to withdraw orreplace the principal mask-portion or body that comprises the side wallsI8 or I8 and the cross-sill 92. In widecarriage machines, thesupplemental-mask members, such as 289, 229, or 225, are also easilyremovable preparatory to removing or replacing the principal-mask part78 92. Figure 2 illustrates how said principal-mask part I8, 92 or 18,

92 may be sprung, mainly at the cross-sill 92,

for spreading the side-walls 18-or I8 in order to facilitate thebringing-together or the separation of said principal-part mask and themain frame. The masking features on the carriage comport with the mainmask.

The rear-masking apron 54, on the carriage, and the back wall I06 of themain mask form a substantially unbroken, and therefore, very pleasingsweep of contour and mask the mechanism at the back of the typewriter.The carriage-end-masking plates I90 have their loweredge contourscomport with the contours of the main-mask side-walls 18, thus conducingto congruity of the carriage-masking features and the main mask. Saidcarriage-end masking plates I90 may have openings, indicated at 24%,Figures 4 and 13, for the platen axle 2553, the latter having, outsideof said plates 3%, suitable fingerknobs 25!, for rotating the platen iemanually.

Variations may be resorted to within the scope of the invention, andportions of the improvemerits may be used without others.

Having thus described my invention, I claim:

1. In framing for a heavy-duty typewriter; a main frame comprising leftand right outer side members and left and right carriage-air-supportinghorns spreading laterally and upwardly from the upper front corners ofsaid side mem bers; a finishing-mask for said frame comprising a mainmask having left and right side to mask the main frame side members,each main-mask-side-wall having a jog at an upper front corner thereofso as to extend upwardly behind and forwardly beneath the correspond--ing horn, two supplemental horn-masking cas ings each having a frontwall, a rear wall and an outer side wall, the rear wall of each casingextending inwardly to the maimmask-side-wall to meet the latter at thejog edge that is behind the horn, each of the main-mask-side-wallshaving a front rim in form of an inturned forwardlyfacing flangeextending up toward the jog, and the front of each horn casing beingformed with a similar flange matching and capping said in- .5 turnedside wall flange, the front and rear wall of each horn-casing havingedges extending substantially below the jogs and abutting the outersides of the main-mask-side-walls, at least one of said edges of eachhorncasing having a hook shaped tongue hooked to the edge of a companionaperture in the main-mask-side-wall to detachably fasten the horn casingat its said edge to the main-mask-side-wa11; and fastening meansdetachably securing said supplemental casings and main--mask-side-wallsto the main frame.

2. In framing for a heavy-duty typewriter; a main frame comprising leftand right outer side members and left and right carriage-rail-supportinghorns spreading laterally and upwardly from the upper front corners ofsaid side memhere; a finishingmiask for said frame comprising a mainmask having left and right side walls to mask the main frame sidemembers, each main-mask-side-wall having a jog at an upper front earnerthereof so as to extend upwardly behind and forwardly beneath thecorresponding horn, two supplemental horn-masking casings each. having afront wall, a rear wall and an outer side wall, the rear wall of eachcasing extending inwardly to the main-mask--side-wall to meet the latterat the jog edge that is behind the horn, casing extending underneath thehorn to meet the main-mask-side-wall and substantially cover the jogedge that is under the horn, each of the main-mask-side-walls having afront rim in the form of an inturned forwardly-facing flange extendingup toward the jog, and the front of each horn-casing being formed with asimilar flange matching and capping said inturned side Wall flange; eachhorn-casing and each main-mask-side-wall having an internal finextending laterally inward, the main frame side members havingforwardly-facing pads against which the fins abut, a plate forming afront Wall of the finishing mask behind the keyboard and overlapping thefins; and securing screws passing through said plate and fins into saidmain-frame member pads.

WILLIAM A, DOBSON. I

CERTIFICATE OF CORRECTION. Patent No. 2,210,569. August 6, 191m;

WILLIAM A. DOBSON.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 7,first column, line 26-27, for carriage-air-supporting" read--carriage-rai1- v supporting"; and that the said Letters Patent shouldbe read with this correction therein that the same may conform to therecord of the casein the Patent Office.

Signed and sealed this Zhth clay of September, A. D. 19).;0.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 2,210,569. I August 6, 191m.

WILLIAM A. DOBSON.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correcticon as follows: Page 7,first column, line 26-27, for "oarriageairsupporting" readcarriage-railsupporting-; and that the said Letters Patent should beread with this correction therein that the same may confonn to therecord of the case in the Patent Office.

Signed and sealed this 2mm day of September, A. in. 191m.

7 Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

